CN110501284A - A device and method for testing the bonding strength of composite pipes under thermal loading conditions - Google Patents

Abstract

The invention relates to a device and method for testing the bonding strength of composite pipes under thermal loading conditions, belonging to the technical field of bonding strength performance testing of composite pipes. Including high-strength pressure-bearing frame, pressure system, heating insulation box, and adjustable bracket; the pressure system is fixed in the high-strength pressure-bearing frame; the variable-diameter indenter is inserted into the heating insulation box, and the composite pipe to be tested is placed on the variable-diameter indenter The upper end surface of the variable diameter indenter is only in contact with the lower end surface of the inner tube of the composite pipe to be tested. The height of the heating insulation box is basically the same as the upper end surface of the test pipe section. In contact with the high-strength frame, the lower surface of the upper cover of the heating insulation box is only in contact with the upper end surface of the outer tube of the composite pipe to be tested; turn on the power supply of the heating insulation box, raise the temperature to the required test temperature, keep warm after the temperature is stable, load the pressure, and observe Pressure changes. When the pressure reaches the maximum value and begins to drop significantly, it indicates that the composite pipe has undergone shear failure, and the pressure value of this process is recorded.

Description

A device and method for testing the bonding strength of composite pipes under thermal loading conditions

technical field

The invention relates to the technical field of composite pipe bonding strength performance testing, in particular to a device and method for testing the bonding strength of composite pipes under thermal loading conditions.

Background technique

The composite pipe is a composite pipe with a double-layer or multi-layer structure composed of two or more materials with different properties. In engineering applications, the material system and production process of the composite pipe can be selected according to the application environment and the performance requirements of the pipe. The selection and design can maximize the complementary advantages of materials. On the basis of ensuring the basic performance of the pipeline, it can improve the corrosion resistance of the pipeline, prolong the service life of the pipeline, and reduce the engineering cost. It can often replace pure stainless steel pipes, copper pipes or Other expensive alloy tubes. At present, various composite pipes have been widely used in petroleum development, chemical industry, metallurgy, shipbuilding, mining, military industry and other fields.

Bonding strength is the most important technical index for evaluating the performance of composite pipes. At present, the specific requirements and test methods for the bonding strength have been given in the relevant standards of different types of composite pipes, such as in GB/T28897 "Steel-Plastic Composite Pipes", SY/T 6855 "Containing H ₂ S/CO ₂ Natural Gas Bimetal Composite Pipes for Field Gathering Pipeline Networks", SY/T 6662.8-2016 "Ceramic Lined Pipes and Fittings" and other standards have made requirements for the bonding strength of composite pipes and given a schematic diagram of the test. These standards all require the bonding strength of composite pipes at room temperature, ignoring the influence of temperature on the bonding strength of composite pipes composed of material systems with different thermal expansion coefficients, which have problems in guiding the application of composite pipes under thermal loading conditions. Inadequacies can easily cause production accidents and hidden safety hazards.

Contents of the invention

In order to solve the above shortcomings, the present invention provides an experimental device and method capable of testing the bonding strength of composite pipes under thermal loading conditions. The experimental method is simple, the experimental device has simple structure, flexible operation, and quick and intuitive testing.

In order to achieve the above object, the present invention is achieved through the following technical solutions:

A device for testing the bonding strength of composite pipes under thermal loading conditions, which is divided into four parts: a high-strength pressure-bearing frame (1), a pressure system (2), a heating insulation box (3), and an adjustable support (4);

The high-strength pressure-bearing frame (1) is used to bear the load of the entire test system. The high-strength pressure-bearing frame is a box structure with through holes (1-2) on the upper part for observing the experimental process and also for adjusting the sample. Location;

The bottom of the pressure system (2) is fixed on the bottom part of the high-strength pressure-bearing frame 1, and is used to generate and output the pressure for testing the bonding strength; Head (2-3), cylinder body (2-4) capable of applying pressure, base (2-5), base (2-5) is fixed on the bottom of pressure system 2, and cylinder body (2-4) is provided with High-precision digital display pressure gauge (2-6) and loading controller (2-7); variable diameter pressure head (2-2) is a cylindrical structure, the diameter of the upper end face is relatively small, and the diameter of the lower end face is relatively large Select the appropriate size of the variable diameter indenter for the pipe size, and its upper end surface is directly in contact with the inner tube end surface of the composite pipe test piece, which is used to apply pressure to the inner tube. The lower end surface of the variable diameter indenter (2-2) is provided with a cylindrical guide Surface groove (2-8), used for stable cooperation with cylindrical indenter (2-3); the top of cylindrical indenter (2-3) and the cylindrical guide surface groove (2 -8) Fitting, used to transfer pressure to the test piece, heat insulating gasket (2-9) is provided at the joint surface where the top of the indenter (2-3) is in contact with the variable diameter indenter, to reduce heat loss and reduce The heat transmitted to the pressure system protects the pressure system; the high-precision digital display pressure gauge (2-6) is used to quickly and intuitively read the pressure value transmitted by the pressure system, and the reading unit is MPa, Psi, KN, etc.

The heating insulation box (3) is located at the upper end of the high-strength pressure-bearing frame (1), and is used to heat the composite pipe section to be tested to a specified temperature, and complete the test at this temperature; it includes the heating insulation box body (3-2), heating element (3-3), heat insulation layer (3-4), heating insulation box upper cover (3-5), temperature sensor (3-6), digital display thermometer and temperature control device (3-7), Heating and incubating box power supply (3-8); heating and incubating box body (3-2) is used to carry other parts of heating and incubating box, and the lower part of heating and incubating box body (3-2) is placed on adjustable support (4) On the top, it is used to fix the heating and incubating box. The adjustable bracket (4) is located in the high-strength pressure-bearing frame (1); the heat insulation layer (3-4) is arranged on the inner surface of the heating and incubating box to prevent heat loss. Maintain the internal temperature of the box; the heating element (3-3) is located inside the heating incubator box (3-2) for heating; the upper cover of the heating incubator (3-5) samples the upper cover connection pin (3-10) Cooperate with the upper port of the heating and incubating box, and the upper surface of the heating and incubating box (3-5) is attached to the high-strength pressure-bearing frame, which is used to bear the pressure generated by the end surface of the upper outer layer of the sample during the test, heating and insulating The upper cover of the box (3-5) has a through hole (3-13). For samples of different sizes, choose the upper cover of the heating and incubating box with different through hole sizes. The through-hole plug (3-11) of heat insulation is used for sealing the upper cover to avoid heat loss; the heating insulation box body (3-2) is provided with a temperature sensor (3-6), a digital display thermometer and an automatic control The temperature device (3-7) is connected and cooperated with the temperature sensor (3-6) and the heating element (3-3), and is used for visually reading the temperature in the heating incubator. When the temperature reaches the set temperature, the temperature control The device controls the heating element to automatically cut off the power, and automatically heats up when the temperature drops to ensure a constant temperature in the box;

The bottom of the heating insulation box 3 has a through hole (3-12), which is used for the upper end of the variable diameter pressure head to extend into the heating insulation box; the inner wall of the through hole (3-12) is provided with a layer of flexible heat insulation material ( 3-9), used to seal the gap between the variable-diameter indenter and the heating insulation box, the flexible thermal insulation material should be able to adapt to the size of different variable-diameter indenters, to prevent heat from being lost from the gap between the variable-diameter indenter and the hole, and will not affect the test results;

The upper part of the high-strength pressure-bearing frame (1) is provided with a through hole, and the diameter of the through-hole on the upper part of the high-strength pressure-bearing frame (1) is not smaller than the through hole (3-13) on the upper cover of the heating and incubating box, and the two are coaxial; the heating and incubating box The diameter of the upper cover through hole (3-13) is larger than the inner diameter of the outer tube of the composite tube to be tested and smaller than the outer diameter of the outer tube; Outer diameter.

The adjustable bracket 4 is fixed inside the high-strength pressure-bearing frame 1, and is used to support and fix the heating and incubating box (3) in a height-adjustable manner.

The pressure head (2-3) is used to adjust the height, and the cylinder body (2-4) is a device capable of continuously increasing the pressure along the axial direction of the variable diameter pressure head (2-2).

The experimental method is as follows: the pressure system is fixed in a high-strength pressure-bearing frame, and the applicable variable-diameter indenter is selected according to the size of the composite pipe to be tested; the variable-diameter indenter is inserted into the heating incubator through the lower hole of the heating incubator, and the test The composite pipe is placed on the variable-diameter indenter and adjusted so that the variable-diameter indenter is coaxial with the composite pipe to be tested, and the upper end surface of the variable-diameter indenter is only in contact with the lower end surface of the inner tube of the composite pipe to be tested. Adjust the heating and heat preservation The height of the box support makes the height of the heating and incubating box basically flush with the upper end surface of the test pipe section. Cover the heating and incubating box, and insert the fixing pin of the upper cover into the pin hole. Slowly increase the height of the pressure head of the pressure system to the heating and incubating box. The upper cover is in light contact with the high-strength frame, and at the same time, the lower surface of the upper cover of the heating incubator is only in contact with the upper end surface of the outer tube of the composite tube to be tested; adjust the height of the bracket of the heating incubator to support the heating incubator; turn on the power of the heating incubator , heat up to the required test temperature at a uniform speed, keep the temperature stable for 15-30 minutes, the pressure system begins to slowly increase the pressure, observe the pressure change, when the pressure reaches the maximum value and begins to drop obviously, it means that the composite pipe has shear damage , record the pressure value of this process, and calculate the binding force of the composite pipe through the maximum value.

The pressure head of the pressure system has undergone a heat treatment process to obtain high hardness and toughness, so as to ensure that it will not be deformed and broken during the pressure application process.

The pressure system is equipped with a high-precision digital display pressure gauge, which can quickly and intuitively read the pressure value. The pressure gauge can be adjusted to MPa, Psi, KN, etc. to meet different reading requirements.

The variable-diameter indenter can be selected according to the size of the composite pipe. The bottom of the variable-diameter indenter is provided with a cylindrical guide surface to ensure the stable cooperation between the variable-diameter indenter and the indenter, and to ensure the accuracy of the experiment.

The junction surface of the top of the indenter in contact with the variable diameter indenter is provided with a thermal insulation gasket to reduce the heat loss of the incubator and protect the pressure system.

The heating and incubating box is equipped with an automatic temperature control device, a heating element is installed inside, and a temperature sensor is installed inside the box. When the temperature reaches the set temperature, the heating element is automatically powered off, and it is automatically heated when the temperature drops to ensure a constant temperature in the box. .

The temperature of the heating and incubating box can be adjusted from room temperature to 1000°C, covering most of the working conditions of current engineering applications.

The heating and incubating box is provided with a digital display thermometer, which can intuitively read the temperature in the box.

The heating and incubating box is equipped with a pin-connected movable upper cover, which is convenient for installing test pipe sections and equipment maintenance. The upper cover has a through hole, and is equipped with a through hole plug for heat insulation. The size of the through hole of the upper cover is closely related to the test pipe section. , Different test pipe sections should choose different upper covers.

The inner wall of the heating and incubating box is provided with a layer of thermal insulation material to avoid heat loss in the box.

There is a through hole at the bottom of the heating and incubating box, and a layer of flexible heat insulation material is provided on the inner wall of the hole, which can adapt to the size of different indenters, prevent heat loss from the gap between the indenter and the hole, and will not affect the test result.

The high-strength pressure-bearing frame is welded by high-strength alloy steel, which can withstand relatively large pressure without deformation.

The height of the heating and incubating box support can be adjusted arbitrarily to provide stable support for the heating and incubating box.

The high-strength pressure-bearing frame is welded by high-strength alloy steel, which can withstand relatively large pressure without deformation.

The pressure system indenter (2-3) cooperates with the variable diameter indenter (2-2) to transmit test pressure, and needs to undergo heat treatment and other processes to obtain higher hardness and toughness.

The beneficial effects of the present invention are as follows:

1. The test method of the present invention has fully considered the actual application conditions of the composite pipe, and the test results have practical significance for guiding the engineering application of the composite pipe.

2. The temperature control range of the present invention is large, covering most of the working conditions of current engineering applications.

3. The present invention fills up the gap in the bond strength test of composite pipes under thermal loading conditions.

Description of drawings

Accompanying drawing 1 is the structural schematic diagram of the device for testing the bonding strength of composite pipes under thermal loading conditions

Accompanying drawing 2 is the top view of the high-strength pressure-bearing frame

Accompanying drawing 3 is the top view of the heating insulation box without pipe fittings

1. High-strength pressure bearing frame; 1-2. Through hole of pressure bearing frame; 2. Pressure system; 2-2. Variable diameter pressure head; 2-3. Pressure head; 2-4. Cylinder body; 2-5. Base; 2-6. High-precision digital display pressure gauge; 2-7. Loading controller; 2-8. Cylindrical guide surface groove; 2-9. Heat insulation gasket; 3. Heating insulation box; 3-2 .Heating insulation box body; 3-3. Heating element; 3-4. Heat insulation layer; 3-5. Heating insulation box upper cover; 3-6. Temperature sensor; 3-7. Thermometer and temperature control device; 3-8. Power supply for heating and incubating box; 3-9. Flexible thermal insulation material; 3-10. Upper cover connection pin; 3-11. Upper cover insulation through hole plug; 3-13. Through hole on the heating insulation box; 4. Adjustable bracket; 5. Test the outer tube (layer) of the composite pipe section; 6. Test the inner pipe (layer) of the composite pipe section.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the test device adopted in the present invention includes a high-strength pressure-bearing frame 1; a pressure system 2, specifically including a variable-diameter indenter 2-2, an indenter 2-3, a cylinder body 2-4, and a base 2-5 , high-precision digital display pressure gauge 2-6, loading controller 2-7, heat insulation gasket 2-9; heating insulation box 3, specifically including heating insulation box body 3-2, heating element 3-3, heat insulation Insulation layer 3-4, heating insulation box upper cover 3-5, temperature sensor 3-6, thermometer and temperature control device 3-7, heating insulation box power supply 3-8, flexible thermal insulation material 3-9, upper cover Connecting pin 3-10, loam cake insulation through-hole plug 3-11; Adjustable support 4 etc. are formed.

The high-strength pressure-bearing frame 1 is used to bear the load of the whole test system, and the upper part of the pressure-bearing frame is provided with through holes 1-2, which are used for observing the experiment process and can also be used for adjusting the position of the sample. The bottom of the pressure system 2 is fixed on the lower part of the high-strength pressure-bearing frame 1, and is used to generate and output pressure for testing the bonding strength. Select the applicable variable-diameter indenter 2-2 according to the parameters of the test piece; insert the variable-diameter indenter 2-2 into the heating incubator 3 through the lower hole 3-12 of the heating incubator, and place the test composite pipe section in the variable-diameter indenter. Put on the head 2-2 and adjust the center of the test pipe section, adjust the height of the adjustable bracket 4 so that the height of the heating incubator box 3-2 is basically flush with the upper end surface of the test pipe section, cover the heating incubator cover 3-5, the upper cover The fixed pin 3-10 is embedded in the pin hole, and the height of the pressure head 2-3 is slowly raised until the upper cover 3-5 of the heating insulation box is in light contact with the high-strength frame 1, and the height of the adjustable bracket 4 is adjusted to support the heating insulation box; Turn on the power supply 3-8 of the heating and incubating box, raise the temperature to the required test temperature, keep it warm for 15-30 minutes after the temperature is stable, control the loading controller 2-7 to start loading slowly, observe the changes in the readings of the pressure gauge 2-6, when the pressure reaches the maximum When the value drops suddenly, it indicates that the composite pipe has undergone shear failure, and the pressure value of this process is recorded.

The pressure system 2 includes a variable-diameter pressure head 2-2, a pressure head 2-3, a cylinder body 2-4, a base 2-5, a high-precision digital display pressure gauge 2-6, and a loading controller 2-7.

The variable-diameter indenter 2-2 and indenter 2-3 in the pressure system 2 are used to directly apply pressure to the test sample, and corresponding treatment should be carried out to obtain high hardness and high toughness, so as to ensure that it will not be deformed during the pressure application process and burst.

The high-precision digital display pressure gauge 2-6 in the pressure system 2 is used to read the pressure value quickly and intuitively. The pressure gauge can adjust the reading unit to MPa, Psi, KN, etc. to meet different reading requirements. Value, the area of the indenter and other parameters, realize the conversion of different unit values to meet different calculation needs.

The variable-diameter indenter 2-2 can be selected according to the size of the test piece, and the bottom of the variable-diameter indenter 2-2 is provided with a cylindrical guide surface 2-8, which is used to guide the cooperation of the variable-diameter indenter and the indenter to ensure that the test accuracy.

A thermal insulation gasket 2-9 is provided on the joint surface where the top of the indenter 2-3 is in contact with the variable diameter indenter 2-2, which is used to reduce the heat loss of the incubator, reduce the heat transferred to the pressure system, and protect the pressure system .

The heating and incubating box 3 is provided with a digital display thermometer and an automatic temperature control device (3-7), and a heating element 3-3 is arranged inside, and a temperature sensor 3-6 is provided in the box for visually reading the temperature in the box. temperature, and when the temperature reaches the set temperature, the temperature control device can control the heating element to automatically power off, and when the temperature drops, the temperature control device can control the heating element to automatically heat to ensure a constant temperature in the box.

The heating and incubating box 3 is provided with a movable upper cover 3-5 connected by pins 3-10, which is used to carry pressure, facilitate the installation of the test pipe section and equipment maintenance, and the upper cover has a through hole 3-13 for observing the position of the test pipe section And test state, upper cover through hole 3-13 is equipped with heat insulation through hole plug 3-11, is used for sealing upper cover in heating and heat preservation process, avoids heat loss. The size of the upper cover through hole 3-13 is closely related to the test pipe section, and different upper cover 3-5 should be selected for different test pipe sections.

The inner wall of the heating and incubating box 3 is provided with a layer of thermal insulation material 3-4 to avoid heat loss in the box.

The bottom of the heating and incubating box 3 is provided with a through hole 3-12, and the inner wall of the hole is provided with a layer of flexible thermal insulation material 3-9, which is used to adapt to the size of different variable-diameter indenters, and prevent heat from passing between the variable-diameter indenters and the hole. Gaps are lost and do not affect test results.

The high-strength pressure-bearing frame 1 is welded by high-strength alloy steel, which can withstand relatively large pressure without deformation.

The heating and incubating box support 4 can be adjusted in height arbitrarily to provide stable support for the heating and incubating box.

The weight of the whole test device of the present invention is only tens of kilograms, and it can be transported at will, and can be operated wherever there is a power supply, so as to meet different test requirements.

Example 1: Test the bonding strength of the bimetal composite pipe at 300°C

(1) Test pipe section preparation: cut 20mm long, 51mm carbon steel pipe combined with 3mm stainless steel pipe is a bimetal composite pipe, the inner diameter of the composite pipe is 56mm, and the diameter of the joint surface of the composite pipe is 62mm. (2) Selection of test accessories: Select a variable-diameter indenter with a diameter of 60mm; (3) Test assembly: Assemble the variable-diameter indenter with the indenter, and place a heat-insulating gasket in the middle; pass the variable-diameter indenter and the heating insulation box through the bottom Through-hole assembly; adjust the center of the test pipe section and place it on the variable-diameter indenter to ensure that the stainless steel layer falls evenly on the variable-diameter indenter; adjust the height of the heating insulation box so that the upper edge of the box body is flush with the upper end surface of the pipe section; cover Put the upper cover of the incubator on, and the fixing pin of the upper cover is embedded in the pin hole; slowly raise the height of the pressure head until the upper cover of the heating incubator touches the high-strength frame lightly, adjust the height of the bracket of the heating incubator to support the heating incubator; confirm the test After the position of the pipe section has no deviation, plug the heat preservation through hole plug of the upper cover; (4) test temperature rise: turn on the power of the heating incubator, raise the temperature to 300°C at a uniform speed, and keep the temperature for 20 minutes after the temperature is stable; (5) pressure test: adjust the pressure gauge Reading unit, load slowly, observe the pressure change, when the pressure reaches the maximum value and begins to drop obviously, it indicates that the composite pipe has shear failure, record the pressure value of this process (6) end of the test: disassemble the equipment, take out the test pipe section, measure And record relevant data, keep photos or video materials, and calculate the bonding strength of composite pipes according to relevant standards.

In the specific test, the above test can be repeated, and the average value of multiple times can be taken as the final test result.

Example 2: Testing the bonding strength of metal-ceramic composite oil pipes at 500°C

(1) Test pipe section preparation: cut 20mm long, The cermet composite pipe with carbon steel pipe and 3mm cermet layer, the inner diameter of the composite pipe is 70mm, and the diameter of the joint surface of the composite pipe is 76mm. (2) Selection of test accessories: Select a variable-diameter indenter with a diameter of 75mm; (3) Test assembly: Assemble the variable-diameter indenter with the indenter, and place a heat-insulating gasket in the middle; pass the variable-diameter indenter and the heating insulation box through the bottom Through-hole assembly; adjust the center of the test pipe section and place it on the variable-diameter indenter to ensure that the ceramic layer falls evenly on the variable-diameter indenter; adjust the height of the heating insulation box so that the upper edge of the box body is flush with the upper end surface of the pipe section; cover Put the upper cover of the incubator on, and the fixing pin of the upper cover is embedded in the pin hole; slowly raise the height of the pressure head until the upper cover of the heating incubator touches the high-strength frame lightly, adjust the height of the bracket of the heating incubator to support the heating incubator; confirm the test After there is no deviation in the position of the pipe section, plug the insulation through-hole plug of the upper cover; (4) Test temperature rise: turn on the power of the heating incubator, raise the temperature to 500°C at a uniform speed, and keep the temperature for 30 minutes after the temperature is stable; (5) Pressure test: Adjust the pressure gauge Reading unit, load slowly, observe the pressure change, when the pressure reaches the maximum value and begins to drop obviously, it indicates that the composite pipe has undergone shear failure, record the pressure value of this process; (6) End of the test: disassemble the equipment, take out the test pipe section, Measure and record relevant data, keep photos or video materials, and calculate the bonding strength of composite pipes according to relevant standards.

In the specific test, the above test can be repeated, and the average value of multiple times can be taken as the final test result.

Claims (7)

1. a kind of device for testing multiple tube bond strength under hot loading environment, which is characterized in that be divided into four parts: high-intensitive Pressure-bearing frame (1), pressure system (2), heater incubator (3), adjustable support (4)；

High-intensitive pressure-bearing frame (1) is used to bear the load of entire test macro, and high-intensitive pressure-bearing frame is body structure, top It is provided with through-hole (1-2), is used for observation experiment process, it may also be used for adjustment sample position；

Pressure system (2) bottom is fixed on the base portion in high-intensitive pressure-bearing frame (1), combines by force for producing and exporting test The pressure of degree；Pressure system includes successively from top to bottom component variable diameter pressure head (2-2), pressure head (2-3), can apply stressed cylinder body (2-4), pedestal (2-5), pedestal (2-5) are fixed on the bottom of pressure system 2, and cylinder body (2-4) is equipped with high accuracy number and shows Pressure gauge (2-6) and load controller (2-7)；Variable diameter pressure head (2-2) is cylindrical structure, and upper end diameter is relatively small, under End surface diameter is relatively large, according to the suitable variable diameter indenter size of multiple tube selection of dimension, thereon end surface directly with it is compound The inner tube end face of pipe test specimen contacts, for inner tube on-load pressure, variable diameter pressure head (2-2) lower end surface to be equipped with cylindrical guide sur-face Groove (2-8) cooperates for stablizing with cylindrical pressure head (2-3)；The circle at cylindrical pressure head (2-3) top and variable diameter pressure head Cylindricality guide surface groove (2-8) cooperation is used for the combination that conducting pressure is contacted to test specimen, pressure head (2-3) top and variable diameter pressure head It is equipped with heat insulating mattress (2-9) at face, for reducing thermal loss, the heat for being transmitted to pressure system is reduced, protects pressure system； High accuracy number shows pressure gauge (2-6), the pressure value for reading pressure system transmitting for quicklook；

Heater incubator (3) is located at high-intensitive pressure-bearing frame (1) inner upper end, for Compound pipe to be tested to be heated to specifying Temperature, and test is completed at this temperature；Including heating and thermal insulation box body (3-2), heating element (3-3), insulating (3- 4), heating and thermal insulation box cover (3-5), temperature sensor (3-6), digital display thermometer and temperature regulating device (3-7), heating and thermal insulation Case power supply (3-8)；Heating and thermal insulation box body (3-2) is used to carry other components of heater incubator, heating and thermal insulation box body (3- 2) lower part is placed on adjustable support (4), and for fixing heater incubator, adjustable support (4) is located at high-intensitive pressure-bearing frame In frame (1)；Insulating (3-4) setting is kept in cabinet in heater incubator interior for preventing heat loss Portion's temperature；Heating element (3-3) is located inside heating and thermal insulation box body (3-2) for heating；Heating and thermal insulation box cover (3-5) is adopted Sample upper cover connecting pin (3-10) is cooperated with heating and thermal insulation box body upper port, the heating and thermal insulation box cover upper surface (3-5) with High-intensitive pressure-bearing frame fitting, the pressure that sample upper outer layer end surfaces generate when for bearing test, heating and thermal insulation box cover (3-5) is provided with through-hole (3-13), and various sizes of sample selects the heating and thermal insulation box cover of different clear size of opening, heater incubator Through hole plug (3-11) at upper cover through-hole (3-13) equipped with heat-insulation and heat-preservation avoids thermal loss for sealing upper cover；Heating and thermal insulation Temperature sensor (3-6), digital display thermometer and automatic temp controller (3-7) and temperature sensing are equipped in box body (3-2) Device (3-6) and heating element (3-3) connection and cooperation, for intuitively reading the temperature in heater incubator, when temperature reaches When set temperature, temperature regulating device control heating element is automatically powered off, and temperature heats automatically when reducing, and guarantees that the temperature inside the box is constant；

3 bottom of heater incubator is provided with through-hole (3-12), extend into heater incubator for variable diameter pressure head upper end；Through-hole (3-12) inner sidewall is equipped with one layer of flexible heat-insulating heat-preserving material (3-9), for sealing between variable diameter pressure head and heating and thermal insulation cabinet Gap, flexible heat-insulating heat-preserving material should be able to adapt to the size of different variable diameter pressure heads, prevent heat from dissipating from the gap in variable diameter pressure head and hole It loses, and will not influence test result；

High-intensitive pressure-bearing frame (1) top is equipped with through-hole, and the through-hole diameter on high-intensitive pressure-bearing frame (1) top is protected not less than heating Incubator upper cover through-hole (3-13) and the two is coaxial；The diameter of heating and thermal insulation box cover through-hole (3-13) is greater than the outer of multiple tube to be measured Pipe interior diameter is less than outer tube overall diameter；The inner tube interior diameter that variable diameter pressure head (2-2) upper end diameter is greater than multiple tube to be measured is small In inner tube overall diameter.

2. a kind of device for testing multiple tube bond strength under hot loading environment described in accordance with the claim 1, which is characterized in that Adjustable support 4 is fixed on inside high-intensitive pressure-bearing frame 1, for supporting and fixing heating and thermal insulation in a manner of height-adjustable Case (3).

3. a kind of device for testing multiple tube bond strength under hot loading environment described in accordance with the claim 1, which is characterized in that Pressure head (2-3) is that can continue to increase pressure apparatus along variable diameter pressure head (2-2) axis direction for adjusting height, cylinder body (2-4).

4. a kind of device for testing multiple tube bond strength under hot loading environment described in accordance with the claim 1, which is characterized in that The heater incubator is equipped with automatic temp controller, and inside is equipped with heating element, temperature sensor is equipped in case, when temperature reaches When set temperature, heating element is automatically powered off, and temperature heats automatically when reducing, and guarantees that the temperature inside the box is constant.

5. a kind of device for testing multiple tube bond strength under hot loading environment described in accordance with the claim 1, which is characterized in that The heater incubator temperature can cover most working conditions of current engineer application in room temperature to adjusting in 1000 DEG C.

6. a kind of device for testing multiple tube bond strength under hot loading environment described in accordance with the claim 1, which is characterized in that The high intensity pressure-bearing frame is welded using high strength alloy steel.

7. using the method for device to test multiple tube bond strength described in any one of claims 1-6, which is characterized in that experiment Method is as follows: pressure system is fixed in high-intensitive pressure-bearing frame, the variable diameter being applicable according to multiple tube size selection to be tested Pressure head；Variable diameter pressure head is inserted into heater incubator by heater incubator lower opening, multiple tube to be tested is placed in variable diameter pressure On head and adjust so that variable diameter pressure head and multiple tube to be tested are coaxial, the upper surface of variable diameter pressure head only with it is to be tested compound The inner tube lower end face contact of pipe, adjustment heater incubator support height make heater incubator box height and test pipeline section upper surface It being substantially flush, covers heating and thermal insulation box cover, upper cover fixed pin is embedded in pin hole, the fall head of pressure system is slowly increased, Gently contacted to heating and thermal insulation box cover with high strength frame, at the same the lower surface of heating and thermal insulation box cover only with it is to be tested compound The outer tube upper end face contact of pipe；Adjustment heater incubator support height makes it support heater incubator；Open heater incubator electricity Source is at the uniform velocity warming up to required test temperature, and temperature keeps the temperature 15-30 minutes after stablizing, and pressure system starts slowly load upwards Pressure observes pressure change, when pressure, which reaches maximum value, to be started to be decreased obviously, illustrates that multiple tube has occurred that shearing is broken It is bad, the pressure value of this process is recorded, the bond strength of maximum value calculation multiple tube is passed through.